-Werror=unused-but-set-variable causes validation error on Windows

After upgrading the inplace mingw to gcc 4.8.3, validate.sh fails with the following error:

cc1.exe: error: -Werror=unused-but-set-variable: No option -Wunused-but-set-variable

The cause is in mk/validate-settings.mk:

ifeq "$(GccLT46)" "NO" SRC_CC_WARNING_OPTS += -Werror=unused-but-set-variable # gcc 4.6 gives 3 warning for giveCapabilityToTask not being inlined SRC_CC_WARNING_OPTS += -Wno-error=inline endif

This checks the version of the inplace mingw, but the actual command line that fails is not using the inplace mingw (4.8.3), but the host ghc's mingw (4.5.3, in /usr/local/mingw).

Command line:

C:/Users/Gintas/Downloads/msys32/usr/local/mingw/bin/../libexec/gcc/mingw32/4.5.2/cc1.exe -quiet -v -Icompiler/. -Icompiler/parser -Icompiler/utils -Icompiler/stage1 -Icompiler/stage1/build/autogen -IC:\Users\Gintas\Downloads\msys32\home\Gintas\ghc\inplace/lib/include/ -iprefix c:\users\gintas\downloads\msys32\usr\local\mingw\bin\../lib/gcc/mingw32/4.5.2/ -isystem C:/Users/Gintas/Downloads/msys32/usr/local/mingw/bin/../lib/gcc/mingw32/4.5.2/include -isystem C:/Users/Gintas/Downloads/msys32/usr/local/mingw/bin/../lib/gcc/mingw32/4.5.2/include-fixed -U__i686 -Di386_HOST_ARCH=1 -Dmingw32_HOST_OS=1 -D__GLASGOW_HASKELL__=708 -U__i686 -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\process-1.2.0.0\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\directory-1.2.1.0\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\time-1.4.2\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\Win32-2.3.0.2\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\bytestring-0.10.4.0\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\base-4.7.0.1\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\integer-gmp-0.5.1.0\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib/include -include compiler/stage1/build/autogen/cabal_macros.h compiler/stage1/build/Fingerprint_hsc_make.c -quiet -dumpbase Fingerprint_hsc_make.c -march=i686 -march=i686 -auxbase-strip compiler/stage1/build/Fingerprint_hsc_make.o -Werror -Wall -Werror=unused-but-set-variable -Wno-error=inline -version -fno-stack-protector -o C:\Users\Gintas\Downloads\msys32\tmp\ccvafaLk.s

Trac metadata

Trac field	Value
Version	7.9
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Build System
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